Machinery for carving stone



NUNITED sTATEs PATENT oEErcE.

EDWIN ALLEN,` OF SOUTH WINDHAM, CONNECTIGUT.

MACHINERY FOR CARVING STONE.

Specification of Letters Patent No. 11,922, dated November 14, 1854.

To all whom t may concern:

Be it known that I, EDWIN ALLEN, of South Windham, in the county of Windham and State of Connecticut,have invented certain new and useful Improvements in Machinery for Carving Stone and other Substances; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1, is a perspective view of a machine constructed according to my invention. Fig. 2, is a sectional view showing the arrangement of the pivots of the pantographs.

The nature of my invention consists in the employment for the purpose of carving stone or other substances of two pantographs combined in a certain way with a tracer and cutting tool whereby the said tracer and cutting tool are rendered capable of moving, not only over" every point in a plane, as in a single pantograph, but also capable of a movement perpendicularly to the said plane for the purpose of tracing over undulating surfaces, and cutting corresponding undulating surfaces. By this combination, statues, bas-reliefs, and 0rnamental compositions of an extremely complicated character, may be cut to pattern with the greatest accuracy.

To enable those skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

A, B, C, D, represent a horizontal pantograph, similar to the single pantographs in common use, turning freely upon a vertical shaft, E, which works in suitable bearings in and below the table, F, and constitutes the driving shaft of the machine, and which carries a pulley, H, which t-ransmit-s rotary motion by a band, I, to another pulley, J, running loosely on a stud (a) which forms the pivot of the leg, C. To the pulley, J, is secured another pulley, K, which transmits motion by a band, L, to a pulley, M, which is secured tothe tool shaft, N, which both turns and works longitudinally in a socket, S, in the leg, C, of the pantograph.

The tool shaft is suspended from the leg, Q, of the second pantograph, O, P, Q, R, by a box, T, in such way that it turns freely therein. The beam, O, of the second pantograph works upon a horizontal pivot (bg which turns freely upon a vertical pivot (c which intersects it at right angles, and has its bearing in a bridge piece, V, striding over the shaft, E, which forms the pivot on which the irst pantograph turns. The pivot if it were attached by a universal joint, to

the main pivot of the first. The tracer, U, is suspended from the leg, P, of the second pantograph, and works freely throu h a fixed socket, Y. The pattern, W, an the block, X, of stone or `other material to be operated upon, are both secured to thetable, F.

The above described combination of two pantographs enables the tracer to follow the most intricate patterns, and the tool to produce a corresponding form on the piece of stone -or other material to be operated upon. M

The most elaborate bas-reliefs may be profduced, without moving the pattern; an by arranging the pattern and the block so as to be turned orver, statues or sculpture may,y

be copied, by earring oneshalf and after-1` ward reversing or changing the pattern, and turning the piece over, to carve the other half. "W

I do not claim to be the first inventor of a machine for carving in which the tracer and cutting tool have their relative motions not only in a horizontal but a vertical plane, and I do not wish to claim the within described combination of pantographs for other purposes than that of carving. But

What I claim as my invention and desire to secure by Letters Patent, is-

The employment for the purpose of carving stone and other substances, of two pantographs, combined with a tracer and cut ting tool as described to wit: the panto graphs being arranged at right angles rto each other and having their main pivots, connected or arranged in such way, as to form or be equivalent to a universal joint, and the tool and tracer, being suspended from or attachedv to the pantograph, O, P,

`Q, R, and passing through sockets in the legs of the pantograph, A, B, C, D,-where by the tracer and tool are allowed a universal movement, as herein set forth.

EDWIN ALLEN.

Witnesses O. D. MUNN, A. BRUEN. 

